Phupoksakul Thunyaluck, Leuangsukrerk Manusawee, Somwangthanaroj Anongnat, Tananuwong Kanitha, Janjarasskul Theeranun
Department of Food Technology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, Thailand.
Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, Thailand.
J Sci Food Agric. 2017 Aug;97(10):3365-3373. doi: 10.1002/jsfa.8187. Epub 2017 Feb 8.
The use of biodegradable polymeric materials has been proposed as an environmentally-friendly alternative to petroleum-based packaging. To extend the shelf life of food products, these bioplastics must possess appropriate barrier properties and food-package stability. In the present study, shelf life analysis of packaged baby formula in biopolymeric, multilayer film, fabricated from poly(lactide) (PLA) and whey protein isolate (WPI), PLA/WPI/PLA and PLA pouches was performed at 4-35 C and 50-59% relative humidity.
Despite the possible sorption of food components into contact PLA surfaces, the results demonstated that the transparency and barrier properties of PLA-based pouches were insignificantly changed over time (P > 0.05), although the films showed a slow rate of color change. The baby formula packaged in PLA/WPI/PLA had a delayed lipid oxidation compared to the sample in the PLA pouch, especially at a higher temperature. The application of WPI in the multilayer structure shifted the shelf life determination factor from lipid oxidation to moisture gain.
The results indicate that the PLA/WPI/PLA pouch has good storage stability. The film could be used to package dry food properly at 4-35 C and 50-59% relative humidity for an extended period of time. © 2016 Society of Chemical Industry.
已提出使用可生物降解的聚合物材料作为石油基包装的环保替代品。为延长食品的保质期，这些生物塑料必须具备适当的阻隔性能和食品包装稳定性。在本研究中，对由聚乳酸（PLA）和乳清蛋白分离物（WPI）制成的生物聚合物多层薄膜、PLA/WPI/PLA以及PLA包装袋包装的婴儿配方奶粉在4至35摄氏度和50至59%相对湿度下进行了保质期分析。
尽管食品成分可能会吸附到接触的PLA表面，但结果表明，基于PLA的包装袋的透明度和阻隔性能随时间变化不显著（P>0.05），尽管薄膜显示出缓慢的颜色变化速率。与PLA包装袋中的样品相比，PLA/WPI/PLA包装的婴儿配方奶粉的脂质氧化有所延迟，尤其是在较高温度下。WPI在多层结构中的应用将保质期决定因素从脂质氧化转变为水分增加。
结果表明PLA/WPI/PLA包装袋具有良好的储存稳定性。该薄膜可用于在4至35摄氏度和50至59%相对湿度下长时间妥善包装干燥食品。©2016化学工业协会。
